+/**
+ * [get_client_id description]
+ * @param [type] $email [description]
+ * @return [type] [description]
+ */
+function get_client_id($email)
+{
+ global $connection;
+ $sql_pquery = "select NumCl from CLIENTS where EmailCl = ?";
+ $connection->prepare_query($sql_pquery);
+ $connection->prepared_query_bind_param("s", array($email));
+ $connection->run_prepared_query();
+ $connection->get_pquery_result();
+ $row = $connection->get_result_array();
+ $connection->close_prepared_query();
+ return $row[0][0];
+}
+
+/**
+ * [nb_booked description]
+ * @param [type] $client_id [description]
+ * @param [type] $flight_id [description]
+ * @return [type] [description]
+ */
+function nb_booked($client_id, $flight_id)
+{
+ global $connection;
+ $sql_pquery = "select SUM(NbPlaces) from RESERVATIONS where NumCl = ? and NumVol = ?";
+ $connection->prepare_query($sql_pquery);
+ $connection->prepared_query_bind_param("is", array($client_id, $flight_id));
+ $connection->run_prepared_query();
+ $connection->get_pquery_result();
+ $row = $connection->get_result_array();
+ $connection->close_prepared_query();
+ return $row[0][0];
+}
+
+/**
+ * [chk_logged_in description]
+ * @return [type] [description]
+ */